1. Spanish
Topping the list of the 12 easiest languages to learn for English speakers is of course, Spanish. After Chinese and English, it is the most spoken language in the world with over 400 million speakers. Since both languages use the Roman alphabet, the common ground has already been built. Further, a vast number of words in English have an associated word in Spanish, thereby making it much easier to learn.
Disclosure: None. Easiest Second Languages to Learn for English Speakers is originally published at Insider Monkey.